The ESPN write-up of him out of high school was that he was a very confident shooter. However, one of the fan comments after the article suggested that his play was reminiscent of a football quarterback with happy feet. Which tells me that he was a very strong player amongst his higth school competition but that his abilities were negated by the more competitive skill level of the Big East. I think that the A10, and what we're trying to accomplish in it, is a lot closer to the Big East. On the surface, he sounds like a player who could come off the bench and hit a couple of threes but not much more ought to be expected.
Also, don't be thrown by the fact that he was "good enough to play in the Big East." You can look at almost any major BCS school and you'll find that the 11th and 12th guys on scholarship are not players who would be stars at lesser BCS schools. These are often good character guys who know that their primary role is to be strong practice players. This is not to say that the school doesn't hope that this player could evolve but these are the exceptions. Major programs who know that they will typically play 8-9 players have this luxury. At a Seton Hall, this player comes in knowing he's a bench player but with more of an opportunity to evolve in to a rotation player than at a big-time program. For Grennan, this was not going to happen at Seton Hall so his leaving makes sense.
Like Kopriva, another Vermont recruit, there will likely be some minor minutes as a best case scenario. This will be further exemplified as our recruiting gets more and more competitive.